Equipment Maintenance and Calibration About LabtronX We keep your - - PowerPoint PPT Presentation
Water Analysis Equipment Maintenance and Calibration About LabtronX We keep your laboratory and monitoring equipment accurate and reliable Accuracy Assurance Program - Regularly scheduled calibration and maintenance on all your lab
Maintenance and Calibration
▪ We keep your laboratory and
monitoring equipment accurate and reliable
▪ Accuracy Assurance Program -
Regularly scheduled calibration and maintenance on all your lab equipment and flow meters
▪ We make it easy and guarantee
your satisfaction
LabtronX
615-831-2554
▪ Have worked at LabtronX for
▪ Became the CEO about 10
years ago
▪ Bought the company from my
father about 5 years ago
▪ Married with 6 kids ▪ Love sailing, the Preds, playing
guitar, directing and writing plays, and my job.
LabtronX
615-831-2554
Information Overload Ahead Everything pH
What pH is How do we measure pH pH Calibration and Maintenance
Calibration and Maintenance Program
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Sorta
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What is…
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Natrium
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Pure Water is non-conductive
Pure water has a pH of 7
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LabtronX
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LabtronX
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▪ pH is an attempt to measure the
ratio of Hydrogen vs. Hydroxyl ions
the hydrogen ion in an aqueous solution.
▪ For each 10 times more H to OH
gives you 1pH unit of acid (below 7)
▪ For each 10 times more OH to H
gives you 1pH unit of base (above 7)
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Millivolts and Electrodes
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LabtronX
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A negative lead (reference) behind a salt junction and a positive lead (pH) behind a glass membrane to read a voltage.
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The pH meter reads positive millivolts when solution is below pH 7 (extra H) and Negative mV when it is above pH 7 (extra OH)
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the negative log
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200 400 600 800 1000 1200
pH7 pH6/8 pH5/9 pH4/10
Ratio vs. pH Curve
1:1 10:1 100:1 1000:1
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59.1 .16 118.3 .32 177.4 .48 pH7 pH6/8 pH5/9 pH4/10
SLOPE OF THE ELECTRODE
mV
Mil illi livol
ts / pH unit it % Slo lope pe 59.16mV 100% 58.57mV 99% 57.98mV 98% 57.39mV 97% 56.79mV 96% 56.20mV 95% 55.61mV 94% 1:1 10:1 100:1 1000:1
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59.1 .16 118.3 .32 177.4 .48 45 45 90 90 135 135 pH7 pH6/8 pH5/9 pH4/10
SLOPE OF THE ELECTRODE
mV lower mV
Temperature does not change the pH,
ATC Probes (Automatic Temperature Compensation) compensate for the theoretical change in the mV output of the pH electrode as it is effected by temperature The further away from 7 the more temperature compensation Triode electrodes have pH elements with less surface
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What we can check
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59.16 .16 118.3 .32 177.4 .48
.16
.32
.48 pH7 pH6/8 pH5/9 pH4/10
SLOPE OF THE ELECTRODE
Base Acid
pH meters have two curves to be calibrated,
Calibrate with a pH7 and at least one other buffer to bracket your readings (4 or 10) Check expiration and open dates of buffers Once opened, 10 Buffer often fails first Calibrate once a day… maybe once a shift
LabtronX
615-831-2554
Mil illi livol
ts / pH unit it % Slo lope pe 59.16mV 100% 58.57mV 99% 57.98mV 98% 57.39mV 97% 56.79mV 96% 56.20mV 95% 55.61mV 94%
96% Slope is a warning 94% Slope is when the electrode should be changed in the water and wastewater field. Look for less than 15mV offset at pH7 Look for quick response at stable temperatures
Liquid wicks better at reference junction than a gel Filling hole allows better flow at reference junction Warranty is typically twice as long
Gels are known to respond slower and can have pH reading errors earlier
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Store electrode wet to keep both junctions active Do not use distilled water for storage Using pH buffers can cause errors pH electrode storage solution (Shameless plug - LabtronX makes this right!) Quick clean with toilet bowl cleaner
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BNCs are the most universal input connectors Meters can be checked with a mV generator to confirm accuracy and response Shorting the input connector will give you 0mV (7pH)
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Digital equipment is precise but may not be accurate Incorrect temperature is more likely to give you a bad slope than a bad reading Using a separate ATC probe gives you more versatility
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LabtronX
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Risk Management
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If its not broke don’t fix it. If it breaks we’ll get a new one. MacGyver has nothing on us! Patch it up and move on. We have trained personnel who perform and document regular maintenance and calibration We’re getting a new plant next year.
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615-831-2554
How do you know your numbers are right?
How do you know that they are always right Or that your equipment will be working when you need it?
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Consumable Components Lightbulbs, Membranes, Glassware Miscalibration Bad Standards, Procedures, or Technique Lack of Maintenance or Care Physical Wear, Dirt, Insects Unstable Systems Power Fluctuations, Discoloration, Changes in Sample Environmental Changes Temperature, Pressure, Humidity Equipment Failure See Next Slide
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Over-stressed Components Overuse or Over Limits Error or Mistakes Lack of Knowledge or Information Lack of Maintenance or Care Inconsistent, Reactive, or Limited Poor Design, Assembly, or Installation Incorrect Equipment, Components, or Engineering Physical Attacks Environmental or Misuse Unimagined Incidents Accidents, Acts of God, or Sabotage
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Why do it? Identifying Risks What do you do? Proactive Actions Who does what? Roles and Responsibilities How often do you do it? Cycles of Uncertainty What results do you expect? Setting Overall Goal
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